Service and maintenance
7.1 General
recommendations
7.2 Condenser
7.3 Service and safety
advice
WARNING
Even if main switch of
condensing unit is in position OFF power still
available at income terminals of main switch.
In case of any service related to electrical
components inside condensing unit it is
recommended to disconnect condensing
unit from the power by switch located before
condensing unit.
It is recommend to check the unit for leakages
minimum once a year and in accordance with
national requirements.
Furthermore following should be checked:
1. Electrical and refrigerant connections for
damages, corrosion etc.
2. The mounting devices (bolts, nuts, etc) of the
unit.
3. Vibrations: if it is on the same level as after
installation or any signs of abnormal vibration.
4. Operation conditions.
5. Airflow across the condenser.
6. Oil level.
7. Tightness of electrical connections.
8. Operation of the crankcase and oil separator
heaters.
Compressor must always be warmer than any
other component in the circuit, even if the circuit is
switched off for seasonal stop.
Condenser should at least once a year be checked
for clogging and be cleaned if deemed necessary.
Access to internal side of condenser takes place
through fan door. Remember to switch off the unit
at main switch before opening the fan door.
In comparison to fin and tube heat exchangers,
microchannel coils tend to accumulate more of the
dirt on the surface and of the less dirt inside which
can make them easier to clean.
Step 1: Remove surface debris
Remove surface dirt, leaves, fibres, etc. with
a vacuum cleaner (preferably with a brush or
other soft attachment rather than a metal tube),
compressed air blown from the inside out, and/
or a soft bristle (not wire!) brush. Do not impact or
scrape the coil with the vacuum tube, air nozzle,
etc.
Step 2: Rinse
Do not use any chemicals (including those
advertised as coil cleaners) to wash microchannel
heat exchangers. They can cause corrosion. Rinse
only with water.
Hose the MCHE off gently, preferably from the
inside out and top to bottom, running the water
through every fin passage until it comes out clean.
Microchannels fins are stronger than traditional
tube & fin coil fins but still need to be handled with
care. Do not bang the hose into the coil.
Step 3: Optional blow dry
Microchannel heat exchangers, because of their
fin geometry, tend to retain water more than
traditional fin & tube coils. It may be beneficial to
blow or vacuum out the rinse water from your unit
to speed drying and prevent pooling.
If the refrigerant system has been opened the
system has to be flushed with dry air or
nitrogen to remove moisture and a new filter dryer
has to be installed. If evacuation of refrigerant has
to be done, it shall be done in such a way that no
refrigerant can escape to the environment. Beware
of hot and cold components in the refrigeration
system. The components in the refrigeration
system are pressurized; as a consequence special
attention has to be paid during operation on these
components.
CAUTION
Do not operate condensing unit
without refrigerant charge or without being
connected to the system.
Safety goggles, gloves, protective clothing, safety
boots, hard hats or another safety equipment
should be worn when necessary.
Never install a system in the field and leave it
unattended when it has no charge, a holding
charge, or with the service valves closed without
electrically locking out the system.
Do not touch the compressor until it has cooled
down. Ensure that other materials in the area of
the compressor do not get in touch with it.
WARNING
Before Starting Repair Work
- Disconnect from mains
- Wait as stated before for discharge of the DC-link.
(Refer section 4.5.1 Warning when touching unit
when OFF)
- Remove compressor cable.
36
FRCC.PC.044.A6.02
Application Guidelines
